4c9792b6a3
AuthnContextClassRef tells the IdP what forms of authentication the user should use on the IdP's server for us to be okay with it. I don't think there's a reason for us to enforce anything here and it should be up to the IdP's configuration to handle authentication how it wants. The default AuthnContextClassRef only allows PasswordProtectedTransport, causing the IdP to e.g. reject authentication with Yubikey in AzureAD SAML - which can be confusing for folks setting up SAML and is just not necessary.
Zulip overview
Zulip is a powerful, open source group chat application that combines the immediacy of real-time chat with the productivity benefits of threaded conversations. Zulip is used by open source projects, Fortune 500 companies, large standards bodies, and others who need a real-time chat system that allows users to easily process hundreds or thousands of messages a day. With over 700 contributors merging over 500 commits a month, Zulip is also the largest and fastest growing open source group chat project.
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